Laxmi Devi, the mother of three children was stabbed several times by her husband Prem Pal Singh, a retired army man, who also slit her throat in a court in Mathura district.
The couple had approached the court in a domestic violence case filed over a month before.
Singh has been arrested after the victim's brother and the court intervened to protect Laxmi Devi who is battling for her life in a hospital in Agra.
A dowry case is also pending against Prem Pal Singh.